<form action="<?php echo url_for('@login'); ?>" method="post">
    <table align="center" style="margin-top: 100px; border: 1px solid black;">
        <tr>
            <td>Correo electrónico</td>
            <td><input type="text" /></td>
        </tr>
        <tr>
            <td>Contraseña</td>
            <td><input type="password" /></td>
        </tr>
        <tr>
            <td colspan="2" align="center">
                <input type="submit" value="Entrar" />
            </td>
        </tr>
    </table>
</form>